VintageBigBlue.org

 

Message - dasd_fast_write


Nov 28, 2018

 


In a 3380 (disk) and 3990 (controller) environment when the CPU requests a block be written to the device the controller stores it in non-volatile internal storage and notifies the CPU the I/O operation is complete before writing the actual block on the disk drive. The 3990 handles all exceptions that may arise.


















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